MongooseError：操作“featureds.find()”缓冲在 10000 毫秒后超时

Question

我在 MongoDB 上有一个集合，我正在尝试使用 find() 查询其中的所有元素：

const mongoose = require('mongoose');
const Featured = mongoose.model('featured');
module.exports = app => {
    app.get('/api/featured', async (req, res) => {
      console.log("featured route");
      const featured = await Featured.find();
      console.log(featured);
      res.send(featured);
    })
}

这是 Featured.js：

const mongoose = require('mongoose');
const { Schema } = mongoose;

const featuredSchema = new Schema({});

mongoose.model('featured', featuredSchema);

但是，我在提出请求时遇到了错误：

(node:75568) UnhandledPromiseRejectionWarning: MongooseError: Operation `featureds.find()` buffering timed out after 10000ms
    at Timeout.<anonymous> (/Users/prikshetsharma/Desktop/humboiserver/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:184:20)
    at listOnTimeout (internal/timers.js:554:17)
    at processTimers (internal/timers.js:497:7)
(node:75568) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)

如何修复此错误并让所有集合项返回find()？奇怪的是，错误显示为featureds.find()，而我从未在任何地方的代码中使用过特色词。

Answer 1

快速修复：

• 在Featured.js中导出模型：

const mongoose = require('mongoose');
const { Schema } = mongoose;
const featuredSchema = new Schema({}, { collection: "featured" });
module.exports = mongoose.model('featured', featuredSchema);

UnhandledPromiseRejectionWarning：未处理的承诺拒绝，

• 您需要将服务代码包装在 try catch 块中，

const mongoose = require('mongoose');
// correct this path to your original path of Featured.js
const Featured = require('./Featured.js');
app.get('/api/featured', async (req, res) => {
  try {
    console.log("featured route");
    const featured = await Featured.find();
    console.log(featured);
    res.send(featured);
  }
  catch(e) {
    console.log('Catch an error: ', e)
  } 
});

featureds.find() 缓冲在 10000 毫秒后超时，

• 会有很多可能性，

1. 从 node_module 和 *.json 文件中删除 mongoose 模块，重新安装 mongoose 模块并重试。
2. 检查您是否已连接数据库，然后检查您的数据库集群是否具有正确的网络访问权限。

Answer 2

对于其他可能偶然发现此问题的人：我的问题与连接错误有关，我设法通过使用 mongoose.connect 而不是 mongoose.createConnection 来解决它。

请注意Mongoose documentation saying:

如果你使用没有连接的模型，Mongoose 默认不会抛出任何错误。

...这只会导致缓冲超时。